Electricity In the Home Lesson One

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Now to E.2.a  Electrical Charges, Field and Currents

Textbook Ref Excel 50 - 55 Jacaranda Preliminary Physics - 92 -98

Write down what you know about charges and electricity (Prior Knowledge)

Looking back we can see ancient "brushes" with static electricity, and jolts from electric eels.

One Scientist made the creative jump to invent the concept of charge (electrons) this is a surprisingly good summary Link  Dr Gilbert - he invented the electroscope that shows charge is something that can be put on objects.

Some Youtubes for You:- an electric eel lights up a christmas tree, and a Dr Gilbert style eletroscope - It was Ben Franklin that worked out the - and + aspects







Charged objects can be charge + or -,  like repel, unlike attract.
Objects are shown with the charges + and - , for insulators they are put on and stick, for conductors the move apart from each other

Rub Perspex and rod is Positive
Rub Ebonite and rod is Negative

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Note you draw charge as + or - and place it in a circle for a free charge that can move
Note because there is a Force and Distance, FORCEDISTANCE = work
Note Insulators - charge stick, Conductors charge moves inside.
Note Insulators can shuffle charge and become polarized

- non syllabus Practical  - Charge electroscope
- non syllabus Practical  - observe Van de Graff.

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E.2.b  -1 C = 6.25E18 electrons

Homework

E.2.F    gather and process secondary information to identify materials that are commonly used as conductors to provide household electricity

LCL worksheet exercises

1. Find the errors in the following answer to "What is the charge on an electron?"
a) 1.609 c   b) 1.60728E-19C  c) 1.6 E -19 C d) -1.6E-19

2. Find the errors in the following drawings

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